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Durum Wheat Genotypic Variation of Yield and Nitrogen use Efficiency and Its Components Under Different Water and Nitrogen Regimes in the Mediterranean Region

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Title Durum Wheat Genotypic Variation of Yield and Nitrogen use Efficiency and Its Components Under Different Water and Nitrogen Regimes in the Mediterranean Region
 
Creator Karrou, Mohammed
 
Contributor Miloudi, Nachit
 
Subject supplemental
uptake
 
Description Farmers in dry areas of the Mediterranean region are reluctant to apply nitrogen (N) fertilizer
to rainfed wheat because of frequent drought. So, it is desirable to select varieties with high nitrogen
use efficiency (NUE). The objectives of this study, conducted in 2009/10 and 2010/11 in Syria,
were to study the response of genotypes of durum wheat to low and high N applications and to evaluate
the contribution of N uptake efficiency and utilization efficiency to NUE under rainfed and
supplemental irrigation conditions. Under the rainfed regime, grain yield decreased significantly in
year 1 and year 2 when applying N fertilizer at a high rate. The early maturing genotypes gave the
highest average yields under rainfed and irrigated regimes. High N fertilizer rate decreased significantly
NUE from 36.1 to 24.3 in year 1 and 37.0 to 5.8 in year 2. Under irrigation, NUE fell from
84.6 to 67.1 in year 1 and from 117.7 to 33.3 in year 2. The contribution of N uptake efficiency
and utilization efficiency to NUE varied from one year to another. In year 1, the contribution of
N utilization efficiency was more important at all nitrogen levels; while the opposite was observed
in year 2 when more N was applied. The fractions of the genotype sum of squares, respectively, for
N uptake efficiency and utilization efficiency were in average 0.15 and 0.78 in year 1 and 0.75
and 0.25 in year 2. From this study we conclude that high N levels in the soil exacerbate the effect
of water stress on productivity and NUE of wheat. Early maturing new genotypes tend to be better
adapted and to use nitrogen more efficiently under limited water conditions. N utilization efficiency
contributes more to NUE under high N availability than N uptake efficiency and vice-versa.
 
Date 2015-03-24
2016-04-01T12:49:43Z
2016-04-01T12:49:43Z
 
Type Journal Article
 
Identifier https://mel.cgiar.org/dspace/limited
https://www.tandfonline.com/doi/abs/10.1080/01904167.2015.1022184
Mohammed Karrou, Nachit Miloudi. (24/3/2015). Durum Wheat Genotypic Variation of Yield and Nitrogen use Efficiency and Its Components Under Different Water and Nitrogen Regimes in the Mediterranean Region. Journal of Plant Nutrition, 38 (14), pp. 2259-2278.
https://hdl.handle.net/20.500.11766/4606
Timeless limited access
 
Language en
 
Rights CC-BY-NC-4.0
 
Format PDF
 
Publisher Taylor & Francis (STM, Behavioural Science and Public Health Titles)
 
Source Journal of Plant Nutrition;38,(2015) Pagination 2259,2278